New multifrequency measurements of the spectrum of the cosmic background radiation.pdf

Adv. Space Res. , No. IO-12, -467, 1984 0273-1177/84 $ + .50
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NEW MULTIFREQUENCY
MEASUREMENTS OF THE SPECTRUM
OF THE COSMIC BACKGROUND
RADIATION
G. Smoot,* G. De Amici,* S. D. Friedman,*
C. Witebski,* N. Mandolesi,** R. B. Partridge,***
G. Sironi,~ L. Danese $ and G. De Zotti$
*Space Science Laboratory and Lawrence Berkeley Laboratory,
University of California, Berkeley, CA,
**Istituto R, Bologna, Italy
***Haverford College, Haverford, PA .
R and Dipartimento di Fisica dell 'Universita', Milano, Italy
¢Istituto di Astronornia, Padova, Italy
ABSTRACT
New measurements of the Cosmic Background Radiation temperature at 12 cm,
cm, 3 cm, cm and cm have made in July 1982 from the White
Mountain High Altitude Research Station. The results are presented and the
existence of spectral distortions discussed.
KEYWORDS
Cosmic Background Radiation; Spectral Distortions; 3K Blackbody; Primordial
perturbations; Cosmology
Small departures of the spectrum of the cosmic background radiation (CBR)
from an exactly Planckian shape may be expected for a variety of physical
reasons. The detection of these small departures and the determination of
their amplitude and spectral characteristics, particularly in the Rayleigh-